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E3608.1.3 Ground Rings
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A ground ring encircling the building or structure, in direct contact with the earth at a depth below the earth's surface of not less than 30 inches (762 mm), consisting of at least 20 feet (6096 mm) of bare copper conductor not smaller than 2 AWG shall be considered as a grounding electrode. [250.52(A)(4)]
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Related Code Sections
(4) Wiring and Protection, Ground Ring
A ground ring encircling the building or structure, in direct contact with the earth, consisting of at least 6.0 m (20 ft) of bare copper conductor ...
E3608.1.3 Services, Ground Rings
A ground ring encircling the building or structure, in direct contact with the earth at a depth below the earth's surface of not less than 30 inches ...
(C) Special Equipment, Grounding
The collector ring used for grounding shall have a current rating not less than that sized in accordance with 675.11(A) ...
675.11 Special Equipment, Collector Rings
The collector ring used for grounding shall have a current rating not less than that sized in accordance ...